Telephone systems, switch architectures and signaling

1. Generating Telephone Dial Tones (postscript)
2. 24-Channel Time Slot Assignment (postscript)
3. Illustration of Time-Slot Interchanging Process (figure)
4. Strowger Switch (figure)
5. Telephone Systems overview (postscript-24 pages)
6. Time-Space-Time (TST) Switching Structure (postscript)
7. System 85 (html)
8. The Hierarchy of Switching Centers in a Telephone Network (figure)
9. Introduction to Signaling (postscript)
10. Conventional Analog Versus CCS Signaling Techniques (figure)
11. Signaling Techniques for Circuit-Switched Networks (postscript)
12. Introduction to ISDN (postscript-3 pages)
13. Evalution of ISDN Applications (text)